package com.nayana.exercicio1;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Date;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.HashSet;



public class Main {

    FileReader FileReader;
    BufferedReader BufferedReader;
    DateFormat format;
    HashSet<String> customer;
    HashSet<String> country;
    SimpleDateFormat formatter;
    Date date;
    ParseException ParseException;
    IOException IOException;
    int lines;
    String columns[];
    String line;
    String string;
    String formattedDate;
    Date datex;
    String readLine() {
        return null;

    }


}

package com.nayana.exercicio1;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;

public class Process {

    public static void main(String[] args) throws FileNotFoundException, ParseException {
        Main pr = new Main();

        pr.BufferedReader = new BufferedReader(new FileReader("C:\Users\nayan\Downloads\orders_04_20_07.txt"));



        new String();

        pr.lines = 0;

        pr.customer = new HashSet<String>();
        pr.country = new HashSet<String>();


        System.out.println("Estas são as datas formatadas: " );


        while(pr.readLine() != null) {

            pr.columns =  ((String) pr.line).split(";");
            pr.lines++;

            //CONTAR QUANTOS COSTUMERID DIFERENTES EXISTEM

            pr.customer.add(pr.columns[4]);
            pr.customer.size();

            //MOSTER DIFERENTES PAÍSES

            pr.country.add(pr.columns[6]);

            //CONVERTER DATA

            pr.string = pr.columns[2];
            pr.format = new SimpleDateFormat("dd-MMM-yyyy");
            pr.date = (Date) pr.format.parse(pr.string);
            pr.format.format(pr.date);
            pr.formattedDate= "";



            try {

                pr.datex = (Date) pr.format.parse(pr.columns[2]);
                pr.formatter = new SimpleDateFormat("yyyy-dd-MM");
                pr.formattedDate = pr.formatter.format(pr.datex);
            } catch (ParseException e1) {

                e1.printStackTrace();
            }

            System.out.println(pr.formattedDate);


        }
        System.out.println("nO número total de linhas é: " + pr.lines);
        System.out.println("nO número total de CustomerId é: " + pr.customer.size());
        System.out.println("nDiferentes países existentes" + pr.country);
    }

}